Q.

Manganese salt + PbO2 + conc. HNO3 → The solution has a purple colour.The color is due to

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a

HMnO4

b

A lead salt

c

MnNO32

d

H2MnO4

answer is A.

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Detailed Solution

Mn2+ is oxidised to Mn7+ forming HMnO4.
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